<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<style type="text/css">
          *{margin:0;padding:0;}
           .layer1{width:100%; height:100px;  background:blue;color:white;text-align:center;}
           .layer2{width:100%; height:400px;}
  
           .layer2-1{width:30%; height:400px; background:red;text-align:center;float:left;}  
           .layer2-2{width:40%; height:400px; background:orange;text-align:center;float:left;} 
		   .layer2-3{width:30%; height:400px; background:red;text-align:center;float:left;}
           .layer2-4{clear:both;}   
           .layer3{width:100%; height:100px;  background:green;color:white;text-align:center;} 
		   .layer4{width:100%; height:100px;  background:blue;color:white;text-align:center;} 
		   .layer5{width:100%; height:100px;  background:#F60;color:white;text-align:center;} 
       </style>
    </head>
    <body>
       <div class="layer1"><h1></h1></div>
       <div class="layer2">
            <div class="layer2-1"><h2></h2></div>
            <div class="layer2-2"><h2></h2></div>
            <div class="layer2-3"><h2></h2></div>
            <div class="layer2-4"></div>
       </div>    
       <div class="layer3"></div>
       <div class="layer4"></div>
       <div class="layer5"></div>

</body>
</html>
